Re: Enough DMARC whinging
Dave Cridland <dave@cridland.net> Mon, 05 May 2014 20:17 UTC
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Date: Mon, 05 May 2014 21:17:43 +0100
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Subject: Re: Enough DMARC whinging
From: Dave Cridland <dave@cridland.net>
To: "Murray S. Kucherawy" <superuser@gmail.com>
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On 5 May 2014 20:51, Murray S. Kucherawy <superuser@gmail.com> wrote: > On Mon, May 5, 2014 at 12:46 PM, Murray S. Kucherawy <superuser@gmail.com>wrote: > >> How? I'm fairly certain it does neither. >> > > Sorry, I missed that there were later replies. > > The SMTP state machine is not changed by DMARC any more than SPF or others > changed it. It doesn't add any new states, verbs, parameters, or anything > else. DMARC sits at least two "layers" above where SMTP operates. As with > any number of other filtering systems, it can influence SMTP's final DATA > reply, but that's hardly unique or even unusual. > > It aims to change the behaviour of Internet Mail as deployed. Whether you want to claim that this is formally extending SMTP, per-se, or not is really something of a moot point - there is certainly an intentional, large, effect on the deployed protocol. Arguing whether this fits the letter of some particular definition smacks of lawyering to my mind. Dave.
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